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CHARLES E. HORE, OF BROOKLYN, NEV YORK.

PROCESS OF MAKING CHROME-YELLOW.

SPECIFICATION forming part of Letters Patent No. 305,391, datedSeptember 16, 1884.

Application filed January 15, 1884. (Specimens) T0 a/ZZ whom it mayconcern:

Be it known that I, CHARLES E. Honn, a citizen of the United States,residing at Brooklyn, in the county of Kings and State of New York, haveinvented new and useful Improve- Sulphate of 1ead....... 65.93 Sulphitcof lead 1.98 Oxide of lead 31.13 Oxide of zinc 0.06

Total 100.00

It is used as'a substitute for white lead.

In carrying out my invention I take five hundred pounds of sublimedlead, thin it with water, and pulp through a fine sieve to remove anycoarse particles Then I put the same into a mixer provided with asuitable agitator. I. then take one hundred and eighty pounds ofbichromate of potash and dissolve it ina suificicnt quantity of water,and this solution I add, either in parts or all at once, to the sublimedlead contained in the mixer un der constant stirring, and finally Iapply coloring-matter is repeatedly washed until cntirely free from thesulphate and sulphite of potash in solution. The resulting product maybe dried in the usual way, and constitutes a bright and brilliantchronic-yellow color. It can be used in the same manner as chrome-yellowmade from white lead; but it can be distinguished therefrom by thepresence of zinc.

\Vhat I claim as new, and desire to secure by Letters Patent, is

The process, substantially as described, for producing a chrome-yellow,said process consisting in mixing sublimed lead with a solution ofbichromate of potash, boiling the mixture, and finally separating theinsoluble coloring-matter from the soluble products, substantially inthe manner set forth.

In testimony whereof I have hereunto set my hand and seal in thepresence of two subscribing witnesses.

WVitnesses:

W. HAUFF,

E. F. KASTENHUBER.

